Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica)
International audience Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the Characteristic Remanent Magnetization (ChRM) incli...
Published in: | Physics of the Earth and Planetary Interiors |
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ftccsdartic:oai:HAL:hal-00616885v1 2023-05-15T13:46:53+02:00 Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) Macrì, Patrizia Sagnotti, Leonardo Dinarès-Turell, Jaume Caburlotto, Andrea 2010-02-25 https://hal.archives-ouvertes.fr/hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885/document https://hal.archives-ouvertes.fr/hal-00616885/file/PEER_stage2_10.1016%252Fj.pepi.2009.12.002.pdf https://doi.org/10.1016/j.pepi.2009.12.002 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pepi.2009.12.002 hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885/document https://hal.archives-ouvertes.fr/hal-00616885/file/PEER_stage2_10.1016%252Fj.pepi.2009.12.002.pdf doi:10.1016/j.pepi.2009.12.002 info:eu-repo/semantics/OpenAccess ISSN: 0031-9201 EISSN: 0031-9201 Physics of the Earth and Planetary Interiors https://hal.archives-ouvertes.fr/hal-00616885 Physics of the Earth and Planetary Interiors, Elsevier, 2010, 179 (1-2), pp.72. ⟨10.1016/j.pepi.2009.12.002⟩ paleomagnetism relative paleointensity Brunhes Chron Matuyama-Brunhes precursor Antarctica info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1016/j.pepi.2009.12.002 2020-12-26T05:31:36Z International audience Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the Characteristic Remanent Magnetization (ChRM) inclination record indicates a normal magnetic polarity for the uppermost 34m of the sequence and a distinctive abrupt polarity change at the bottom of the core. This polarity change, which spans a 27cm thick stratigraphic interval, represents a detailed record of the Matuyama-Brunhes (M-B) transition and it is preceded by a sharp oscillation in paleomagnetic directions that may correlate to the M-B precursor event. Paleomagnetic measurements enable reconstruction of geomagnetic relative paleointensity (RPI) variations, and a high-resolution age model was established by correlating the CADO RPI curve to the available global reference RPI stack, indicating that the studied sequence reaches back to ca 800 ka with an average sedimentation rate of 4.4cm/ka. Orbital periodicities (100 ka and 41 ka) were found in the ChRM inclination record, and a significant coherence of ChRM inclination and RPI record around 100 ka suggests that long-term geomagnetic secular variation in inclination is controlled by changes in the relative strength of the geocentric axial dipole and persistent non-dipole components. Moreover, even if the relatively homogeneous rock magnetic parameters and lithofacies throughout the recovered sequence indicates a substantial stability of the East Antarctic Ice Sheet during the middle and late Pleistocene, influence of the 100 ka and 41 ka orbital periodicities has been detected in some rock magnetic parameters, indicating subtle variations in the concentration and grain-size of the magnetic minerals linked to orbital forcing of the global climate. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic East Antarctica East Antarctic Ice Sheet Wilkes Land ENVELOPE(120.000,120.000,-69.000,-69.000) Physics of the Earth and Planetary Interiors 179 1-2 72 86 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
paleomagnetism relative paleointensity Brunhes Chron Matuyama-Brunhes precursor Antarctica |
spellingShingle |
paleomagnetism relative paleointensity Brunhes Chron Matuyama-Brunhes precursor Antarctica Macrì, Patrizia Sagnotti, Leonardo Dinarès-Turell, Jaume Caburlotto, Andrea Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
topic_facet |
paleomagnetism relative paleointensity Brunhes Chron Matuyama-Brunhes precursor Antarctica |
description |
International audience Paleomagnetic and rock magnetic investigation was performed on the 35-m long MD03-2595 CADO (Coring Adélie Diatom Oozes) piston core recovered on the continental rise of the Wilkes Land Basin (East Antarctica). Analysis of the Characteristic Remanent Magnetization (ChRM) inclination record indicates a normal magnetic polarity for the uppermost 34m of the sequence and a distinctive abrupt polarity change at the bottom of the core. This polarity change, which spans a 27cm thick stratigraphic interval, represents a detailed record of the Matuyama-Brunhes (M-B) transition and it is preceded by a sharp oscillation in paleomagnetic directions that may correlate to the M-B precursor event. Paleomagnetic measurements enable reconstruction of geomagnetic relative paleointensity (RPI) variations, and a high-resolution age model was established by correlating the CADO RPI curve to the available global reference RPI stack, indicating that the studied sequence reaches back to ca 800 ka with an average sedimentation rate of 4.4cm/ka. Orbital periodicities (100 ka and 41 ka) were found in the ChRM inclination record, and a significant coherence of ChRM inclination and RPI record around 100 ka suggests that long-term geomagnetic secular variation in inclination is controlled by changes in the relative strength of the geocentric axial dipole and persistent non-dipole components. Moreover, even if the relatively homogeneous rock magnetic parameters and lithofacies throughout the recovered sequence indicates a substantial stability of the East Antarctic Ice Sheet during the middle and late Pleistocene, influence of the 100 ka and 41 ka orbital periodicities has been detected in some rock magnetic parameters, indicating subtle variations in the concentration and grain-size of the magnetic minerals linked to orbital forcing of the global climate. |
format |
Article in Journal/Newspaper |
author |
Macrì, Patrizia Sagnotti, Leonardo Dinarès-Turell, Jaume Caburlotto, Andrea |
author_facet |
Macrì, Patrizia Sagnotti, Leonardo Dinarès-Turell, Jaume Caburlotto, Andrea |
author_sort |
Macrì, Patrizia |
title |
Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
title_short |
Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
title_full |
Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
title_fullStr |
Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
title_full_unstemmed |
Relative geomagnetic paleointensity of the Brunhes Chron and the Matuyama-Brunhes precursor as recorded in sediment core from Wilkes Land Basin (Antarctica) |
title_sort |
relative geomagnetic paleointensity of the brunhes chron and the matuyama-brunhes precursor as recorded in sediment core from wilkes land basin (antarctica) |
publisher |
HAL CCSD |
publishDate |
2010 |
url |
https://hal.archives-ouvertes.fr/hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885/document https://hal.archives-ouvertes.fr/hal-00616885/file/PEER_stage2_10.1016%252Fj.pepi.2009.12.002.pdf https://doi.org/10.1016/j.pepi.2009.12.002 |
long_lat |
ENVELOPE(120.000,120.000,-69.000,-69.000) |
geographic |
Antarctic East Antarctica East Antarctic Ice Sheet Wilkes Land |
geographic_facet |
Antarctic East Antarctica East Antarctic Ice Sheet Wilkes Land |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet Wilkes Land |
op_source |
ISSN: 0031-9201 EISSN: 0031-9201 Physics of the Earth and Planetary Interiors https://hal.archives-ouvertes.fr/hal-00616885 Physics of the Earth and Planetary Interiors, Elsevier, 2010, 179 (1-2), pp.72. ⟨10.1016/j.pepi.2009.12.002⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pepi.2009.12.002 hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885 https://hal.archives-ouvertes.fr/hal-00616885/document https://hal.archives-ouvertes.fr/hal-00616885/file/PEER_stage2_10.1016%252Fj.pepi.2009.12.002.pdf doi:10.1016/j.pepi.2009.12.002 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.pepi.2009.12.002 |
container_title |
Physics of the Earth and Planetary Interiors |
container_volume |
179 |
container_issue |
1-2 |
container_start_page |
72 |
op_container_end_page |
86 |
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1766245503076401152 |